JUST DAYS after President Trump officially informed the United Nations of his plan to remove the U.S. from the Paris climate agreement, which the U.S. joined in 2016. The National Oceanic and Atmospheric Administration (NOAA) confirmed 2016 as the warmest year on record.

Known as the State of the Climate, the annual report is prepared by more than 450 scientists from more than 60 countries around the world and published in conjunction with the American Meteorological Society. It's the most comprehensive annual summary of Earth's climate.

The Paris agreement aims to keep global temperatures from rising more than 2 degrees Celsius (3.6 degrees Fahrenheit) above pre-industrial levels.

[caption id="attachment_74517" align="alignleft" width="300"] 2017 has seen increasing forest fires[/caption]

The combined influence of long-term global warming and a strong El Niño early in the year led to last year's all-time record heat, NOAA said.

While El Niño is a natural warming of Pacific Ocean water, man-made global warming is caused by greenhouse gases released into the atmosphere from the burning of fossil fuels such as oil, gas and coal.

The amount of carbon dioxide, one of the main greenhouse gases, in the atmosphere climbed to its highest level in 800,000 years, the report found.

The report also noted other signs of a warming planet in 2016:

Greenhouse gases were the highest on record.

[caption id="attachment_74520" align="alignright" width="300"] Antarctic sea ice reducing[/caption]

Sea-surface temperatures were the highest on record.

Global upper ocean heat content near-record high.

Global sea level was the highest on record.

Antarctic had a record low sea ice extent.

The U.S. alone endured 15 separate weather or climate-related disasters last year. At a cost of some $46 billion, it amounted to the second-highest total since 1980, when the records began.